Gammastack - Backend Developer - Node.js/Express.js

Description :

- Design, build, and maintain scalable RESTful APIs and microservices architecture.

- Write, debug, and optimize complex raw SQL queries for performance and scalability.

- Work with PostgreSQL and Sequelize ORM for data modeling and management.

- Implement caching solutions using Redis & Integrate real-time features using Socket.io.

- Develop and integrate smart contracts (Solidity / Rust).

- Work with blockchain protocols (Ethereum, Polygon, BNB Chain, Solana, etc.) to enable smooth crypto transactions.

- Design and implement wallet integrations (MetaMask, WalletConnect, custom/custodian wallets).

- Integrate Web3.js / Ethers.js or similar blockchain libraries into the backend.

Required Skills :

- Expertise in raw SQL queries, indexing, joins, query tuning, and optimization.

- Strong proficiency in PostgreSQL and Sequelize ORM.

- Hands-on experience with Docker, Redis, and Socket.io.

- Familiarity with AWS cloud services (EC2, S3, RDS).

- Strong understanding of backend performance optimization techniques.

- Proven leadership or mentoring experience in engineering teams.

- Strong proficiency in Solidity (Rust is a plus).

- Experience with Web3.js / Ethers.js or similar blockchain libraries.

- Experience with multiple blockchain protocols (Ethereum, Polygon, BNB Chain, Solana, etc.

- Knowledge of wallet integrations (MetaMask, WalletConnect, custom/custodian wallets).

Must-Have Skills :

- PostgreSQL (raw SQL, Sequelize ORM).

- Redis caching & Socket.io real-time features.

- Solidity smart contracts & major blockchain protocols (Ethereum, Polygon, BNB, Solana).

- Web3.js / Ethers.js & wallet integrations (MetaMask, WalletConnect).

- Docker & basic AWS deployment skills.

- Backend performance optimization & team leadership.